Abhay, thanks for your note and pictures. I have picked up "Coin forgery" as one of the areas to specialize in numismatics and each picture/input is helpful.
The 1939 coin displayed by you is clearly a cast coin, but made well. Just yesterday I purchased a 1939 forgery, but costs have gone up considerably even for good forgeries. I will be posting pictures in a day.
By the way 1911 half rupee forgeries from Thailand have now landed in India via Calcutta coin fair. I acquired one of these yesterday and will post pictures very soon.
Friends here who have fake coins in their collection are requested to help me with my studies. I solicit pictures of these coins scanned at 1200 dpi or higher resolution. Alternately, digital pictures taken at 5mega pixels or higher would be a great help.
-- Shastri